/* $Id$
This file is part of the HandBrake source code.
- Homepage: <http://handbrake.m0k.org/>.
+ Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License. */
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+
#include "hb.h"
#include "lang.h"
#include "a52dec/a52.h"
-
-#include <string.h>
+#include "libavcodec/avcodec.h"
+#include "libavformat/avformat.h"
#define min(a, b) a < b ? a : b
+/*
+ * This table defines how ISO MPEG stream type codes map to HandBrake
+ * codecs. It is indexed by the 8 bit stream type and contains the codec
+ * worker object id and a parameter for that worker proc (ignored except
+ * for the ffmpeg-based codecs in which case it is the ffmpeg codec id).
+ *
+ * Entries with a worker proc id of 0 or a kind of 'U' indicate that HB
+ * doesn't handle the stream type.
+ */
+typedef struct {
+ enum { U, A, V } kind; /* unknown / audio / video */
+ int codec; /* HB worker object id of codec */
+ int codec_param; /* param for codec (usually ffmpeg codec id) */
+ const char* name; /* description of type */
+} stream2codec_t;
+
+#define st(id, kind, codec, codec_param, name) \
+ [id] = { kind, codec, codec_param, name }
+
+static const stream2codec_t st2codec[256] = {
+ st(0x01, V, WORK_DECMPEG2, 0, "MPEG1"),
+ st(0x02, V, WORK_DECMPEG2, 0, "MPEG2"),
+ st(0x03, A, HB_ACODEC_MPGA, CODEC_ID_MP2, "MPEG1"),
+ st(0x04, A, HB_ACODEC_MPGA, CODEC_ID_MP2, "MPEG2"),
+ st(0x05, U, 0, 0, "ISO 13818-1 private section"),
+ st(0x06, U, 0, 0, "ISO 13818-1 PES private data"),
+ st(0x07, U, 0, 0, "ISO 13522 MHEG"),
+ st(0x08, U, 0, 0, "ISO 13818-1 DSM-CC"),
+ st(0x09, U, 0, 0, "ISO 13818-1 auxiliary"),
+ st(0x0a, U, 0, 0, "ISO 13818-6 encap"),
+ st(0x0b, U, 0, 0, "ISO 13818-6 DSM-CC U-N msgs"),
+ st(0x0c, U, 0, 0, "ISO 13818-6 Stream descriptors"),
+ st(0x0d, U, 0, 0, "ISO 13818-6 Sections"),
+ st(0x0e, U, 0, 0, "ISO 13818-1 auxiliary"),
+ st(0x0f, A, HB_ACODEC_MPGA, CODEC_ID_AAC, "ISO 13818-7 AAC Audio"),
+ st(0x10, V, WORK_DECAVCODECV, CODEC_ID_MPEG4, "MPEG4"),
+ st(0x11, A, HB_ACODEC_MPGA, CODEC_ID_AAC_LATM, "MPEG4 LATM AAC"),
+ st(0x12, U, 0, 0, "MPEG4 generic"),
+
+ st(0x14, U, 0, 0, "ISO 13818-6 DSM-CC download"),
+
+ st(0x1b, V, WORK_DECAVCODECV, CODEC_ID_H264, "H.264"),
+
+ st(0x80, U, 0, 0, "DigiCipher II Video"),
+ st(0x81, A, HB_ACODEC_AC3, 0, "AC-3"),
+ st(0x82, A, HB_ACODEC_MPGA, CODEC_ID_DTS, "HDMV DTS"),
+ st(0x83, A, HB_ACODEC_LPCM, 0, "LPCM"),
+ st(0x84, A, 0, 0, "SDDS"),
+ st(0x85, U, 0, 0, "ATSC Program ID"),
+ st(0x86, U, 0, 0, "SCTE 35 splice info"),
+ st(0x87, A, 0, 0, "E-AC-3"),
+
+ st(0x8a, A, HB_ACODEC_DCA, 0, "DTS"),
+
+ st(0x91, A, HB_ACODEC_AC3, 0, "AC-3"),
+ st(0x92, U, 0, 0, "Subtitle"),
+
+ st(0x94, A, 0, 0, "SDDS"),
+ st(0xa0, V, 0, 0, "MSCODEC"),
+
+ st(0xea, V, WORK_DECAVCODECV, CODEC_ID_VC1, "VC1"),
+};
+#undef st
+
typedef enum {
hb_stream_type_unknown = 0,
- hb_stream_type_transport,
- hb_stream_type_program
+ transport,
+ program,
+ dvd_program,
+ ffmpeg
} hb_stream_type_t;
#define kMaxNumberVideoPIDS 1
int errors; /* total errors so far */
int last_error_frame; /* frame # at last error message */
int last_error_count; /* # errors at last error message */
+ int packetsize; /* Transport Stream packet size */
int64_t ts_lastpcr; /* the last pcr we found in the TS stream */
int64_t ts_nextpcr; /* the next pcr to put in a PS packet */
+ uint8_t *ts_packet; /* buffer for one TS packet */
uint8_t *ts_buf[kMaxNumberDecodeStreams];
int ts_pos[kMaxNumberDecodeStreams];
int8_t ts_foundfirst[kMaxNumberDecodeStreams];
* we learn during the initial scan but cache so it can be
* reused during the conversion read.
*/
- int16_t ts_video_pids[kMaxNumberVideoPIDS];
- int16_t ts_audio_pids[kMaxNumberAudioPIDS];
-
uint8_t ts_number_video_pids;
uint8_t ts_number_audio_pids;
+ int16_t ts_video_pids[kMaxNumberVideoPIDS];
+ int16_t ts_audio_pids[kMaxNumberAudioPIDS];
+
uint8_t ts_streamid[kMaxNumberDecodeStreams];
- uint8_t ts_audio_stream_type[kMaxNumberDecodeStreams];
+ uint8_t ts_stream_type[kMaxNumberDecodeStreams];
char *path;
FILE *file_handle;
- hb_stream_type_t stream_type;
- int opentype;
+ hb_stream_type_t hb_stream_type;
+ hb_title_t *title;
+
+ AVFormatContext *ffmpeg_ic;
+ AVPacket *ffmpeg_pkt;
+ double ffmpeg_tsconv[MAX_STREAMS];
struct {
int lang_code;
static hb_audio_t *hb_ts_stream_set_audio_id_and_codec(hb_stream_t *stream,
int aud_pid_index);
static void hb_ps_stream_find_audio_ids(hb_stream_t *stream, hb_title_t *title);
-static off_t align_to_next_packet(FILE* f);
+static off_t align_to_next_packet(hb_stream_t *stream);
+
+static int ffmpeg_open( hb_stream_t *stream, hb_title_t *title );
+static void ffmpeg_close( hb_stream_t *d );
+static hb_title_t *ffmpeg_title_scan( hb_stream_t *stream );
+static int ffmpeg_read( hb_stream_t *stream, hb_buffer_t *buf );
+static int ffmpeg_seek( hb_stream_t *stream, float frac );
/*
* streams have a bunch of state that's learned during the scan. We don't
free( ss );
}
-static inline int check_ps_sync(const uint8_t *buf)
+/*
+ * logging routines.
+ * these frontend hb_log because transport streams can have a lot of errors
+ * so we want to rate limit messages. this routine limits the number of
+ * messages to at most one per minute of video. other errors that occur
+ * during the minute are counted & the count is output with the next
+ * error msg we print.
+ */
+static void ts_warn_helper( hb_stream_t *stream, char *log, va_list args )
+{
+ // limit error printing to at most one per minute of video (at 30fps)
+ ++stream->errors;
+ if ( stream->frames - stream->last_error_frame >= 30*60 )
+ {
+ char msg[256];
+
+ vsnprintf( msg, sizeof(msg), log, args );
+
+ if ( stream->errors - stream->last_error_count < 10 )
+ {
+ hb_log( "stream: error near frame %d: %s", stream->frames, msg );
+ }
+ else
+ {
+ int Edelta = stream->errors - stream->last_error_count;
+ double Epcnt = (double)Edelta * 100. /
+ (stream->frames - stream->last_error_frame);
+ hb_log( "stream: %d new errors (%.0f%%) up to frame %d: %s",
+ Edelta, Epcnt, stream->frames, msg );
+ }
+ stream->last_error_frame = stream->frames;
+ stream->last_error_count = stream->errors;
+ }
+}
+
+static void ts_warn( hb_stream_t *stream, char *log, ... )
+{
+ va_list args;
+ va_start( args, log );
+ ts_warn_helper( stream, log, args );
+ va_end( args );
+}
+
+static void ts_err( hb_stream_t *stream, int curstream, char *log, ... )
+{
+ va_list args;
+ va_start( args, log );
+ ts_warn_helper( stream, log, args );
+ va_end( args );
+
+ stream->ts_skipbad[curstream] = 1;
+ stream->ts_pos[curstream] = 0;
+ stream->ts_streamcont[curstream] = -1;
+}
+
+static int check_ps_sync(const uint8_t *buf)
{
// a legal MPEG program stream must start with a Pack header in the
// first four bytes.
(buf[2] == 0x01) && (buf[3] == 0xba);
}
-static inline int check_ts_sync(const uint8_t *buf)
+static int check_ps_sys(const uint8_t *buf)
+{
+ // a legal MPEG program stream must start with a Pack followed by a
+ // SYS. If we've already verified the pack, this skips over it and checks
+ // for the sys header.
+ int pos = 14 + ( buf[13] & 0x7 ); // skip over the PACK
+ return (buf[pos+0] == 0x00) && (buf[pos+1] == 0x00) &&
+ (buf[pos+2] == 0x01) && (buf[pos+3] == 0xbb);
+}
+
+static int check_ts_sync(const uint8_t *buf)
{
// must have initial sync byte, no scrambling & a legal adaptation ctrl
return (buf[0] == 0x47) && ((buf[3] >> 6) == 0) && ((buf[3] >> 4) > 0);
}
-static inline int have_ts_sync(const uint8_t *buf)
+static int have_ts_sync(const uint8_t *buf, int psize)
{
- return check_ts_sync(&buf[0*188]) && check_ts_sync(&buf[1*188]) &&
- check_ts_sync(&buf[2*188]) && check_ts_sync(&buf[3*188]) &&
- check_ts_sync(&buf[4*188]) && check_ts_sync(&buf[5*188]) &&
- check_ts_sync(&buf[6*188]) && check_ts_sync(&buf[7*188]);
+ return check_ts_sync(&buf[0*psize]) && check_ts_sync(&buf[1*psize]) &&
+ check_ts_sync(&buf[2*psize]) && check_ts_sync(&buf[3*psize]) &&
+ check_ts_sync(&buf[4*psize]) && check_ts_sync(&buf[5*psize]) &&
+ check_ts_sync(&buf[6*psize]) && check_ts_sync(&buf[7*psize]);
}
static int hb_stream_check_for_ts(const uint8_t *buf)
{
// transport streams should have a sync byte every 188 bytes.
- // search the first KB of buf looking for at least 8 consecutive
+ // search the first 8KB of buf looking for at least 8 consecutive
// correctly located sync patterns.
int offset = 0;
- for ( offset = 0; offset < 1024; ++offset )
+ for ( offset = 0; offset < 8*1024-8*188; ++offset )
{
- if ( have_ts_sync( &buf[offset]) )
- return 1;
+ if ( have_ts_sync( &buf[offset], 188) )
+ return 188 | (offset << 8);
+ if ( have_ts_sync( &buf[offset], 192) )
+ return 192 | (offset << 8);
+ if ( have_ts_sync( &buf[offset], 204) )
+ return 204 | (offset << 8);
+ if ( have_ts_sync( &buf[offset], 208) )
+ return 208 | (offset << 8);
}
return 0;
}
static int hb_stream_check_for_ps(const uint8_t *buf)
{
- // program streams should have a Pack header every 2048 bytes.
- // check that we have 4 of these.
+ // program streams should start with a PACK then a SYS header.
+ return check_ps_sync(buf) && check_ps_sys(buf);
+}
+
+static int hb_stream_check_for_dvd_ps(const uint8_t *buf)
+{
+ // DVD program streams should have a Pack header every 2048 bytes.
+ // check that we have 4 of these in a row.
return check_ps_sync(&buf[0*2048]) && check_ps_sync(&buf[1*2048]) &&
check_ps_sync(&buf[2*2048]) && check_ps_sync(&buf[3*2048]);
}
if ( fread(buf, 1, sizeof(buf), stream->file_handle) == sizeof(buf) )
{
- if ( hb_stream_check_for_ts(buf) != 0 )
+ int psize;
+ if ( ( psize = hb_stream_check_for_ts(buf) ) != 0 )
{
- hb_log("file is MPEG Transport Stream");
- stream->stream_type = hb_stream_type_transport;
+ int offset = psize >> 8;
+ psize &= 0xff;
+ hb_log("file is MPEG Transport Stream with %d byte packets"
+ " offset %d bytes", psize, offset);
+ stream->packetsize = psize;
+ stream->hb_stream_type = transport;
hb_ts_stream_init(stream);
return 1;
}
+ if ( hb_stream_check_for_dvd_ps(buf) != 0 )
+ {
+ hb_log("file is MPEG DVD Program Stream");
+ stream->hb_stream_type = dvd_program;
+ return 1;
+ }
if ( hb_stream_check_for_ps(buf) != 0 )
{
hb_log("file is MPEG Program Stream");
- stream->stream_type = hb_stream_type_program;
+ stream->hb_stream_type = program;
return 1;
}
}
int i=0;
+ if ( d->ts_packet )
+ {
+ free( d->ts_packet );
+ d->ts_packet = NULL;
+ }
for (i = 0; i < kMaxNumberDecodeStreams; i++)
{
if (d->ts_buf[i])
***********************************************************************
*
**********************************************************************/
-hb_stream_t * hb_stream_open( char *path, int opentype )
+hb_stream_t * hb_stream_open( char *path, hb_title_t *title )
{
-
FILE *f = fopen( path, "r" );
if ( f == NULL )
{
* (even if we have saved state, the stream may have changed).
*/
hb_stream_t *ss = hb_stream_lookup( path );
- if ( opentype == 1 )
+ if ( title && ss && ss->hb_stream_type != ffmpeg )
{
- /* opening to read - we must have saved state */
- if ( ss == NULL )
- {
- hb_log( "hb_stream_open: error: re-opening %s but no scan state", path );
- fclose( f );
- free( d );
- return NULL;
- }
/*
* copy the saved state since we might be encoding the same stream
* multiple times.
*/
memcpy( d, ss, sizeof(*d) );
d->file_handle = f;
- d->opentype = opentype;
+ d->title = title;
d->path = strdup( path );
- if ( d->stream_type == hb_stream_type_transport )
+ if ( d->hb_stream_type == transport )
{
+ d->ts_packet = malloc( d->packetsize );
+
int i = 0;
for ( ; i < d->ts_number_video_pids + d->ts_number_audio_pids; i++)
{
d->ts_buf[i] = malloc( HB_DVD_READ_BUFFER_SIZE );
}
hb_stream_seek( d, 0. );
+
+ if ( d->packetsize == 188 )
+ {
+ // Assume that an over-the-air transport stream can lose PCR
+ // packets and try to filter out the timing inconsistencies.
+ title->flaky_clock = 1;
+ }
}
return d;
}
* If it's something we can deal with (MPEG2 PS or TS) return a stream
* reference structure & null otherwise.
*/
-
if ( ss != NULL )
{
hb_stream_state_delete( ss );
}
d->file_handle = f;
- d->opentype = opentype;
+ d->title = title;
d->path = strdup( path );
- if (d->path != NULL && hb_stream_get_type( d ) != 0 )
+ if (d->path != NULL )
{
- return d;
+ if ( hb_stream_get_type( d ) != 0 )
+ {
+ return d;
+ }
+ fclose( d->file_handle );
+ d->file_handle = NULL;
+ if ( ffmpeg_open( d, title ) )
+ {
+ return d;
+ }
+ }
+ if ( d->file_handle )
+ {
+ fclose( d->file_handle );
}
- fclose( d->file_handle );
if (d->path)
{
free( d->path );
void hb_stream_close( hb_stream_t ** _d )
{
hb_stream_t *stream = * _d;
+
+ if ( stream->hb_stream_type == ffmpeg )
+ {
+ ffmpeg_close( stream );
+ hb_stream_delete( stream );
+ *_d = NULL;
+ return;
+ }
+
if ( stream->frames )
{
hb_log( "stream: %d good frames, %d errors (%.0f%%)", stream->frames,
stream->errors, (double)stream->errors * 100. /
(double)stream->frames );
}
+
/*
* if the stream was opened for a scan, cache the result, otherwise delete
* the state.
*/
- if ( stream->opentype == 0 )
+ if ( stream->title == NULL )
{
hb_stream_delete_dynamic( stream );
if ( stream_state_list == NULL )
for (i = indx+1; i < stream->ts_number_audio_pids; ++i)
{
stream->ts_audio_pids[indx] = stream->ts_audio_pids[i];
- stream->ts_audio_stream_type[1 + indx] = stream->ts_audio_stream_type[1+i];
+ stream->ts_stream_type[1 + indx] = stream->ts_stream_type[1+i];
stream->ts_streamid[1 + indx] = stream->ts_streamid[1 + i];
++indx;
}
**********************************************************************/
hb_title_t * hb_stream_title_scan(hb_stream_t *stream)
{
+ if ( stream->hb_stream_type == ffmpeg )
+ return ffmpeg_title_scan( stream );
+
// 'Barebones Title'
hb_title_t *aTitle = hb_title_init( stream->path, 0 );
aTitle->index = 1;
// the elementary stream is an audio type.
// - For program streams read the first 4MB and take every unique
// audio stream we find.
- if (stream->stream_type == hb_stream_type_transport)
+ if (stream->hb_stream_type == transport)
{
int i;
stream->ts_audio_pids[stream->ts_number_audio_pids++] =
stream->pmt_info.PCR_PID;
}
+
+ // set up the video codec to use for this title
+ aTitle->video_codec = st2codec[stream->ts_stream_type[0]].codec;
+ aTitle->video_codec_param = st2codec[stream->ts_stream_type[0]].codec_param;
}
else
{
}
/*
+ * read the next transport stream packet from 'stream'. Return NULL if
+ * we hit eof & a pointer to the sync byte otherwise.
+ */
+static const uint8_t *next_packet( hb_stream_t *stream )
+{
+ uint8_t *buf = stream->ts_packet + stream->packetsize - 188;
+
+ while ( 1 )
+ {
+ if ( fread(stream->ts_packet, 1, stream->packetsize, stream->file_handle) !=
+ stream->packetsize )
+ {
+ return NULL;
+ }
+ if (buf[0] == 0x47)
+ {
+ return buf;
+ }
+ // lost sync - back up to where we started then try to re-establish.
+ off_t pos = ftello(stream->file_handle) - stream->packetsize;
+ off_t pos2 = align_to_next_packet(stream);
+ if ( pos2 == 0 )
+ {
+ hb_log( "next_packet: eof while re-establishing sync @ %lld", pos );
+ return NULL;
+ }
+ ts_warn( stream, "next_packet: sync lost @ %lld, regained after %lld bytes",
+ pos, pos2 );
+ }
+}
+
+/*
+ * skip to the start of the next PACK header in program stream src_stream.
+ */
+static void skip_to_next_pack( hb_stream_t *src_stream )
+{
+ // scan forward until we find the start of the next pack
+ uint32_t strt_code = -1;
+ int c;
+
+ flockfile( src_stream->file_handle );
+ while ( ( c = getc_unlocked( src_stream->file_handle ) ) != EOF )
+ {
+ strt_code = ( strt_code << 8 ) | c;
+ if ( strt_code == 0x000001ba )
+ // we found the start of the next pack
+ break;
+ }
+ funlockfile( src_stream->file_handle );
+
+ // if we didn't terminate on an eof back up so the next read
+ // starts on the pack boundary.
+ if ( c != EOF )
+ {
+ fseeko( src_stream->file_handle, -4, SEEK_CUR );
+ }
+}
+
+/*
* scan the next MB of 'stream' to find the next start packet for
* the Packetized Elementary Stream associated with TS PID 'pid'.
*/
static const uint8_t *hb_ts_stream_getPEStype(hb_stream_t *stream, uint32_t pid)
{
- static uint8_t buf[188];
- int npack = 100000; // max packets to read
+ int npack = 300000; // max packets to read
while (--npack >= 0)
{
- if (fread(buf, 1, 188, stream->file_handle) != 188)
+ const uint8_t *buf = next_packet( stream );
+ if ( buf == NULL )
{
hb_log("hb_ts_stream_getPEStype: EOF while searching for PID 0x%x", pid);
return 0;
}
- if (buf[0] != 0x47)
- {
- hb_log("hb_ts_stream_getPEStype: lost sync while searching for PID 0x%x", pid);
- align_to_next_packet(stream->file_handle);
- continue;
- }
/*
* The PES header is only in TS packets with 'start' set so we check
udata += buf[4] + 1;
break;
}
- return &buf[udata];
+ /* PES hdr has to begin with an mpeg start code */
+ if (buf[udata+0] == 0x00 && buf[udata+1] == 0x00 && buf[udata+2] == 0x01)
+ {
+ return &buf[udata];
+ }
}
/* didn't find it */
hb_buffer_t *es;
// 'buf' contains an MPEG2 PACK - get a list of all it's elementary streams
- hb_demux_ps(buf, list);
+ hb_demux_ps( buf, list, 0 );
while ( ( es = hb_list_item( list, 0 ) ) )
{
{
struct pts_pos pp = { 0, 0 };
- if ( stream->stream_type == hb_stream_type_program )
- {
- // round address down to nearest dvd sector start
- fpos &=~ ( HB_DVD_READ_BUFFER_SIZE - 1 );
- fseeko( stream->file_handle, fpos, SEEK_SET );
- pp.pts = hb_ps_stream_getVideoPTS( stream );
- }
- else
+ if ( stream->hb_stream_type == transport )
{
const uint8_t *buf;
fseeko( stream->file_handle, fpos, SEEK_SET );
- align_to_next_packet( stream->file_handle );
+ align_to_next_packet( stream );
buf = hb_ts_stream_getPEStype( stream, stream->ts_video_pids[0] );
if ( buf == NULL )
{
( (uint64_t)buf[12] << 7 ) |
( (uint64_t)buf[13] >> 1 );
}
+ else
+ {
+ // round address down to nearest dvd sector start
+ fpos &=~ ( HB_DVD_READ_BUFFER_SIZE - 1 );
+ fseeko( stream->file_handle, fpos, SEEK_SET );
+ if ( stream->hb_stream_type == program )
+ {
+ skip_to_next_pack( stream );
+ }
+ pp.pts = hb_ps_stream_getVideoPTS( stream );
+ }
pp.pos = ftello(stream->file_handle);
- hb_log("hb_sample_pts: pts %lld at %llu", pp.pts, pp.pos );
return pp;
}
**********************************************************************/
int hb_stream_read( hb_stream_t * src_stream, hb_buffer_t * b )
{
- if ( src_stream->stream_type == hb_stream_type_program )
+ if ( src_stream->hb_stream_type == ffmpeg )
+ {
+ return ffmpeg_read( src_stream, b );
+ }
+ if ( src_stream->hb_stream_type == dvd_program )
{
size_t amt_read = fread(b->data, HB_DVD_READ_BUFFER_SIZE, 1,
src_stream->file_handle);
return (amt_read > 0);
}
+ if ( src_stream->hb_stream_type == program )
+ {
+ // a general program stream has arbitrary sized pack's. we're
+ // currently positioned at the start of a pack so read up to but
+ // not including the start of the next, expanding the buffer
+ // as necessary.
+ uint8_t *cp = b->data;
+ uint8_t *ep = cp + b->alloc;
+ uint32_t strt_code = -1;
+ int c;
+
+ // consume the first byte of the initial pack so we don't match on
+ // it in the loop below.
+ if ( ( c = getc( src_stream->file_handle ) ) == EOF )
+ return 0;
+
+ *cp++ = c;
+
+ flockfile( src_stream->file_handle );
+ while ( ( c = getc_unlocked( src_stream->file_handle ) ) != EOF )
+ {
+ strt_code = ( strt_code << 8 ) | c;
+ if ( strt_code == 0x000001ba )
+ // we found the start of the next pack
+ break;
+ if ( cp >= ep )
+ {
+ // need to expand the buffer
+ int curSize = cp - b->data;
+ hb_buffer_realloc( b, curSize * 2 );
+ cp = b->data + curSize;
+ ep = b->data + b->alloc;
+ }
+ *cp++ = c;
+ }
+ funlockfile( src_stream->file_handle );
+
+ // if we didn't terminate on an eof back up so the next read
+ // starts on the pack boundary.
+ b->size = cp - b->data;
+ if ( c != EOF )
+ {
+ fseeko( src_stream->file_handle, -4, SEEK_CUR );
+ b->size -= 4;
+ }
+ return 1;
+ }
return hb_ts_stream_decode( src_stream, b->data );
}
**********************************************************************/
int hb_stream_seek( hb_stream_t * src_stream, float f )
{
- off_t stream_size, cur_pos, new_pos;
- double pos_ratio = f;
- cur_pos = ftello(src_stream->file_handle);
- fseeko(src_stream->file_handle,0 ,SEEK_END);
- stream_size = ftello(src_stream->file_handle);
- new_pos = (off_t) ((double) (stream_size) * pos_ratio);
- new_pos &=~ (HB_DVD_READ_BUFFER_SIZE - 1);
- int r = fseeko(src_stream->file_handle, new_pos, SEEK_SET);
-
- if (r == -1)
- {
- fseeko(src_stream->file_handle, cur_pos, SEEK_SET);
- return 0;
- }
+ if ( src_stream->hb_stream_type == ffmpeg )
+ {
+ return ffmpeg_seek( src_stream, f );
+ }
+ off_t stream_size, cur_pos, new_pos;
+ double pos_ratio = f;
+ cur_pos = ftello( src_stream->file_handle );
+ fseeko( src_stream->file_handle, 0, SEEK_END );
+ stream_size = ftello( src_stream->file_handle );
+ new_pos = (off_t) ((double) (stream_size) * pos_ratio);
+ new_pos &=~ (HB_DVD_READ_BUFFER_SIZE - 1);
+
+ int r = fseeko( src_stream->file_handle, new_pos, SEEK_SET );
+ if (r == -1)
+ {
+ fseeko( src_stream->file_handle, cur_pos, SEEK_SET );
+ return 0;
+ }
+
+ if ( src_stream->hb_stream_type == transport )
+ {
+ // We need to drop the current decoder output and move
+ // forwards to the next transport stream packet.
+ hb_ts_stream_reset(src_stream);
+ }
+ else if ( src_stream->hb_stream_type == program )
+ {
+ skip_to_next_pack( src_stream );
+ }
+
+ return 1;
+}
+
+static const char* make_upper( const char* s )
+{
+ static char name[8];
+ char *cp = name;
+ char *ep = cp + sizeof(name)-1;
+
+ while ( *s && cp < ep )
+ {
+ *cp++ = islower(*s)? toupper(*s) : *s;
+ ++s;
+ }
+ *cp = 0;
+ return name;
+}
- if (src_stream->stream_type == hb_stream_type_transport)
- {
- // We need to drop the current decoder output and move
- // forwards to the next transport stream packet.
- hb_ts_stream_reset(src_stream);
- }
+static void set_audio_description( hb_audio_t *audio, iso639_lang_t *lang )
+{
+ /* XXX
+ * This is a duplicate of code in dvd.c - it should get factored out
+ * into a common routine. We probably should only be putting the lang
+ * code or a lang pointer into the audio config & let the common description
+ * formatting routine in scan.c do all the stuff below.
+ */
+ const char *codec_name;
+ AVCodecContext *cc;
- return 1;
+ if ( audio->config.in.codec == HB_ACODEC_FFMPEG &&
+ ( cc = hb_ffmpeg_context( audio->config.in.codec_param ) ) &&
+ avcodec_find_decoder( cc->codec_id ) )
+ {
+ codec_name = make_upper( avcodec_find_decoder( cc->codec_id )->name );
+ if ( !strcmp( codec_name, "LIBFAAD" ) )
+ {
+ codec_name = "AAC";
+ }
+ }
+ else if ( audio->config.in.codec == HB_ACODEC_MPGA &&
+ avcodec_find_decoder( audio->config.in.codec_param ) )
+ {
+ codec_name = avcodec_find_decoder( audio->config.in.codec_param )->name;
+ }
+ else
+ {
+ codec_name = audio->config.in.codec == HB_ACODEC_AC3 ? "AC3" :
+ audio->config.in.codec == HB_ACODEC_DCA ? "DTS" :
+ audio->config.in.codec == HB_ACODEC_MPGA ? "MPEG" :
+ audio->config.in.codec == HB_ACODEC_LPCM ? "LPCM" :
+ audio->config.in.codec == HB_ACODEC_FFMPEG ? "FFMPEG" :
+ "Unknown";
+ }
+ snprintf( audio->config.lang.description,
+ sizeof( audio->config.lang.description ), "%s (%s)",
+ strlen(lang->native_name) ? lang->native_name : lang->eng_name,
+ codec_name );
+ snprintf( audio->config.lang.simple, sizeof( audio->config.lang.simple ), "%s",
+ strlen(lang->native_name) ? lang->native_name : lang->eng_name );
+ snprintf( audio->config.lang.iso639_2, sizeof( audio->config.lang.iso639_2 ),
+ "%s", lang->iso639_2);
}
static hb_audio_t *hb_ts_stream_set_audio_id_and_codec(hb_stream_t *stream,
const uint8_t *buf;
fseeko(stream->file_handle, 0, SEEK_SET);
- align_to_next_packet(stream->file_handle);
+ align_to_next_packet(stream);
buf = hb_ts_stream_getPEStype(stream, stream->ts_audio_pids[aud_pid_index]);
/* check that we found a PES header */
+ uint8_t stype = 0;
if (buf && buf[0] == 0x00 && buf[1] == 0x00 && buf[2] == 0x01)
{
- if (buf[3] == 0xbd)
+ // 0xbd is the normal container for AC3/DCA/PCM/etc. 0xfd indicates an
+ // extended stream id (ISO 13818-1(2007)). If we cared about the
+ // real id we'd have to look inside the PES extension to find it.
+ // But since we remap stream id's when we generate PS packets from
+ // the TS packets we can just ignore the actual id.
+ if ( buf[3] == 0xbd || buf[3] == 0xfd )
{
audio->id = 0x80bd | (aud_pid_index << 8);
- audio->config.in.codec = HB_ACODEC_AC3;
- hb_log("transport stream pid 0x%x (type 0x%x) is AC-3 audio id 0x%x",
- stream->ts_audio_pids[aud_pid_index],
- stream->ts_audio_stream_type[1 + aud_pid_index],
- audio->id);
- stream->ts_audio_stream_type[1 + aud_pid_index] = 0x81;
- stream->ts_streamid[1 + aud_pid_index] = buf[3];
+ stype = stream->ts_stream_type[1 + aud_pid_index];
+ if ( st2codec[stype].kind == U )
+ {
+ // XXX assume unknown stream types are AC-3 (if they're not
+ // audio we'll find that out during the scan but if they're
+ // some other type of audio we'll end up ignoring them).
+ stype = 0x81;
+ stream->ts_stream_type[1 + aud_pid_index] = 0x81;
+ }
+ stream->ts_streamid[1 + aud_pid_index] = 0xbd;
}
else if ((buf[3] & 0xe0) == 0xc0)
{
- audio->id = buf[3] | aud_pid_index;
- audio->config.in.codec = HB_ACODEC_MPGA;
- hb_log("transport stream pid 0x%x (type 0x%x) is MPEG audio id 0x%x",
- stream->ts_audio_pids[aud_pid_index],
- stream->ts_audio_stream_type[1 + aud_pid_index],
- audio->id);
- stream->ts_audio_stream_type[1 + aud_pid_index] = 0x03;
- stream->ts_streamid[1 + aud_pid_index] = buf[3];
+ audio->id = 0xc0 | aud_pid_index;
+ stype = stream->ts_stream_type[1 + aud_pid_index];
+ if ( st2codec[stype].kind == U )
+ {
+ // XXX assume unknown stream types are MPEG audio
+ stype = 0x03;
+ stream->ts_stream_type[1 + aud_pid_index] = 0x03;
+ }
}
}
- fseeko(stream->file_handle, cur_pos, SEEK_SET);
- if (! audio->config.in.codec)
+ // if we found an audio stream type & HB has a codec that can decode it
+ // finish configuring the audio so we'll add it to the title's list.
+ if ( st2codec[stype].kind == A && st2codec[stype].codec )
+ {
+ stream->ts_streamid[1 + aud_pid_index] = audio->id;
+ audio->config.in.codec = st2codec[stype].codec;
+ audio->config.in.codec_param = st2codec[stype].codec_param;
+ set_audio_description( audio,
+ lang_for_code( stream->a52_info[aud_pid_index].lang_code ) );
+ hb_log("transport stream pid 0x%x (type 0x%x) is %s audio id 0x%x",
+ stream->ts_audio_pids[aud_pid_index],
+ stype, st2codec[stype].name, audio->id);
+ }
+ else
{
- hb_log("transport stream pid 0x%x (type 0x%x) isn't audio",
- stream->ts_audio_pids[aud_pid_index],
- stream->ts_audio_stream_type[1 + aud_pid_index]);
+ if ( buf )
+ {
+ hb_log("transport stream pid 0x%x (type 0x%x, substream 0x%x) "
+ "isn't audio", stream->ts_audio_pids[aud_pid_index],
+ stream->ts_stream_type[1 + aud_pid_index], buf[3]);
+ }
+ else
+ {
+ hb_log("transport stream pid 0x%x (type 0x%x) isn't audio",
+ stream->ts_audio_pids[aud_pid_index],
+ stream->ts_stream_type[1 + aud_pid_index]);
+ }
}
+ fseeko(stream->file_handle, cur_pos, SEEK_SET);
return audio;
}
return;
}
+ set_audio_description( audio, lang_for_code( 0 ) );
hb_list_add( title->list_audio, audio );
}
hb_buffer_t *es;
// 'buf' contains an MPEG2 PACK - get a list of all it's elementary streams
- hb_demux_ps(buf, list);
+ hb_demux_ps( buf, list, 0 );
while ( ( es = hb_list_item( list, 0 ) ) )
{
}
/***********************************************************************
- * hb_stream_update_audio
+ * hb_ts_stream_init
***********************************************************************
*
**********************************************************************/
-void hb_stream_update_audio(hb_stream_t *stream, hb_audio_t *audio)
+
+static void hb_ts_stream_init(hb_stream_t *stream)
{
- iso639_lang_t *lang;
+ int i;
- if (stream->stream_type == hb_stream_type_transport)
+ for (i=0; i < kMaxNumberDecodeStreams; i++)
{
- // Find the audio stream info for this PID. The stream index is
- // the subchannel id which is in the bottom four bits for MPEG audio
- // and the bottom four bits of the upper byte for everything else.
- int i = ( audio->id >= 0xd0 ? audio->id >> 8 : audio->id ) & 0xf;
- if (i >= stream->ts_number_audio_pids)
- {
- hb_log("hb_stream_update_audio: no PID for audio stream 0x%x",
- audio->id);
- return;
- }
- if (audio->id < 0xd0)
- {
- /* XXX fake mpeg audio sample rate & bps */
- stream->a52_info[i].flags = A52_STEREO;
- stream->a52_info[i].rate = 48000 /*Hz*/;
- stream->a52_info[i].bitrate = 384000 /*Bps*/;
- }
-
- lang = lang_for_code(stream->a52_info[i].lang_code);
- if (!audio->config.in.samplerate)
- audio->config.in.samplerate = stream->a52_info[i].rate;
- if (!audio->config.in.bitrate)
- audio->config.in.bitrate = stream->a52_info[i].bitrate;
- if (!audio->priv.config.a52.ac3flags)
- audio->priv.config.a52.ac3flags = audio->config.flags.ac3 = stream->a52_info[i].flags;
-
+ stream->ts_streamcont[i] = -1;
}
- else
+ stream->ts_video_pids[0] = -1;
+ for ( i = 0; i < stream->ts_number_audio_pids; i++ )
{
- // XXX should try to get language code from the AC3 bitstream
- lang = lang_for_code(0x0000);
+ stream-> ts_audio_pids[i] = -1;
}
- if (!audio->config.in.channel_layout)
- {
- switch( audio->config.flags.ac3 & A52_CHANNEL_MASK )
- {
- /* mono sources */
- case A52_MONO:
- case A52_CHANNEL1:
- case A52_CHANNEL2:
- audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_MONO;
- break;
- /* stereo input */
- case A52_CHANNEL:
- case A52_STEREO:
- audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_STEREO;
- break;
- /* dolby (DPL1 aka Dolby Surround = 4.0 matrix-encoded) input */
- case A52_DOLBY:
- audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_DOLBY;
- break;
- /* 3F/2R input */
- case A52_3F2R:
- audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_3F2R;
- break;
- /* 3F/1R input */
- case A52_3F1R:
- audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_3F1R;
- break;
- /* other inputs */
- case A52_3F:
- audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_3F;
- break;
- case A52_2F1R:
- audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_2F1R;
- break;
- case A52_2F2R:
- audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_2F2R;
- break;
- /* unknown */
- default:
- audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_STEREO;
- }
+ stream->ts_packet = malloc( stream->packetsize );
- /* add in our own LFE flag if the source has LFE */
- if (audio->config.flags.ac3 & A52_LFE)
- {
- audio->config.in.channel_layout = audio->config.in.channel_layout | HB_INPUT_CH_LAYOUT_HAS_LFE;
- }
- }
+ // Find the audio and video pids in the stream
+ hb_ts_stream_find_pids(stream);
- snprintf( audio->config.lang.description, sizeof( audio->config.lang.description ), "%s (%s)", strlen(lang->native_name) ? lang->native_name : lang->eng_name,
- audio->config.in.codec == HB_ACODEC_AC3 ? "AC3" : ( audio->config.in.codec == HB_ACODEC_MPGA ? "MPEG" : ( audio->config.in.codec == HB_ACODEC_DCA ? "DTS" : "LPCM" ) ) );
- snprintf( audio->config.lang.simple, sizeof( audio->config.lang.simple ), "%s", strlen(lang->native_name) ? lang->native_name : lang->eng_name );
- snprintf( audio->config.lang.iso639_2, sizeof( audio->config.lang.iso639_2 ), "%s", lang->iso639_2);
-
- if ( (audio->config.flags.ac3 & A52_CHANNEL_MASK) == A52_DOLBY ) {
- sprintf( audio->config.lang.description + strlen( audio->config.lang.description ),
- " (Dolby Surround)" );
- } else {
- sprintf( audio->config.lang.description + strlen( audio->config.lang.description ),
- " (%d.%d ch)",
- HB_INPUT_CH_LAYOUT_GET_DISCRETE_FRONT_COUNT(audio->config.in.channel_layout) +
- HB_INPUT_CH_LAYOUT_GET_DISCRETE_REAR_COUNT(audio->config.in.channel_layout),
- HB_INPUT_CH_LAYOUT_GET_DISCRETE_LFE_COUNT(audio->config.in.channel_layout));
+ for (i = 0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
+ {
+ // demuxing buffer for TS to PS conversion
+ stream->ts_buf[i] = malloc( HB_DVD_READ_BUFFER_SIZE );
}
- hb_log( "stream: audio %x: lang %s, rate %d, bitrate %d, "
- "flags = 0x%x", audio->id, audio->config.lang.description, audio->config.in.samplerate,
- audio->config.in.bitrate, audio->config.flags.ac3 );
-
+ stream->ts_streamid[0] = 0xE0; // stream 0 must be video
}
-/***********************************************************************
- * hb_ts_stream_init
- ***********************************************************************
- *
- **********************************************************************/
+#define MAX_HOLE 208*80
-static void hb_ts_stream_init(hb_stream_t *stream)
+static off_t align_to_next_packet(hb_stream_t *stream)
{
- int i;
+ uint8_t buf[MAX_HOLE];
+ off_t pos = 0;
+ off_t start = ftello(stream->file_handle);
- for (i=0; i < kMaxNumberDecodeStreams; i++)
- {
- stream->ts_streamcont[i] = -1;
- }
- stream->ts_video_pids[0] = -1;
- for ( i = 0; i < stream->ts_number_audio_pids; i++ )
- {
- stream-> ts_audio_pids[i] = -1;
+ if ( start >= stream->packetsize ) {
+ start -= stream->packetsize;
+ fseeko(stream->file_handle, start, SEEK_SET);
}
- // Find the audio and video pids in the stream
- hb_ts_stream_find_pids(stream);
-
- stream->ts_streamid[0] = 0xE0; // stream 0 must be video
-
- for (i = 0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
+ if (fread(buf, sizeof(buf), 1, stream->file_handle) == 1)
{
- // demuxing buffer for TS to PS conversion
- stream->ts_buf[i] = malloc( HB_DVD_READ_BUFFER_SIZE );
- }
-}
-
-// ------------------------------------------------------------------------------------
-
-static off_t align_to_next_packet(FILE* f)
-{
- unsigned char buf[188*20];
-
- off_t start = ftello(f);
- off_t pos = 0;
+ const uint8_t *bp = buf;
+ int i;
- if (fread(buf, 188*20, 1, f) == 1)
- {
- int found = 0;
- while (!found && (pos < 188))
- {
- found = 1;
- int i = 0;
- for (i = 0; i < 188*20; i += 188)
- {
- unsigned char c = buf[pos+i];
- // Check sync byte
- if ((c != 0x47) && (c != 0x72) && (c != 0x29))
- {
- // this offset failed, try next
- found = 0;
- pos++;
- break;
- }
- }
- }
+ for ( i = sizeof(buf); --i >= 0; ++bp )
+ {
+ if ( have_ts_sync( bp, stream->packetsize ) )
+ {
+ break;
+ }
+ }
+ if ( i >= 0 )
+ {
+ pos = ( bp - buf ) - stream->packetsize + 188;
+ if ( pos < 0 )
+ pos = 0;
+ }
}
-
- if (pos == 188)
- pos = 0; // failed to find anything!!!!!?
-
- fseeko(f, start+pos, SEEK_SET);
-
+ fseeko(stream->file_handle, start+pos, SEEK_SET);
return pos;
}
}
}
+static const char *stream_type_name (uint8_t stream_type)
+{
+ return st2codec[stream_type].name? st2codec[stream_type].name : "Unknown";
+}
+
int decode_program_map(hb_stream_t* stream)
{
bitbuf_t bb;
int cur_pos = 9 /* data after the section length field*/ + program_info_length;
int done_reading_stream_types = 0;
while (!done_reading_stream_types)
- {
- unsigned char stream_type = get_bits(&bb, 8);
- get_bits(&bb, 3);
- unsigned int elementary_PID = get_bits(&bb, 13);
- get_bits(&bb, 4);
- unsigned int ES_info_length = get_bits(&bb, 12);
-
- int i=0;
- unsigned char *ES_info_buf = (unsigned char *) malloc(ES_info_length);
- for (i=0; i < ES_info_length; i++)
- {
- ES_info_buf[i] = get_bits(&bb, 8);
- }
-
- if (stream_type == 0x02)
- {
- if (stream->ts_number_video_pids <= kMaxNumberVideoPIDS)
- stream->ts_number_video_pids++;
- stream->ts_video_pids[stream->ts_number_video_pids-1] = elementary_PID;
- }
- else
- {
- // Defined audio stream types are 0x81 for AC-3/A52 audio and 0x03
- // for mpeg audio. But content producers seem to use other
- // values (0x04 and 0x06 have both been observed) so at this point
- // we say everything that isn't a video pid is audio then at the end
- // of hb_stream_title_scan we'll figure out which are really audio
- // by looking at the PES headers.
- i = stream->ts_number_audio_pids;
- if (i < kMaxNumberAudioPIDS)
- stream->ts_number_audio_pids++;
- stream->ts_audio_pids[i] = elementary_PID;
- stream->ts_audio_stream_type[1 + i] = stream_type;
-
- if (ES_info_length > 0)
- {
- decode_element_descriptors(stream, i, ES_info_buf, ES_info_length);
- }
- }
+ {
+ unsigned char stream_type = get_bits(&bb, 8);
+ get_bits(&bb, 3);
+ unsigned int elementary_PID = get_bits(&bb, 13);
+ get_bits(&bb, 4);
+ unsigned int ES_info_length = get_bits(&bb, 12);
+
+ int i=0;
+ unsigned char *ES_info_buf = (unsigned char *) malloc(ES_info_length);
+ for (i=0; i < ES_info_length; i++)
+ {
+ ES_info_buf[i] = get_bits(&bb, 8);
+ }
- cur_pos += 5 /* stream header */ + ES_info_length;
- free(ES_info_buf);
+ if (stream->ts_number_video_pids == 0 && st2codec[stream_type].kind == V )
+ {
+ stream->ts_video_pids[0] = elementary_PID;
+ stream->ts_stream_type[0] = stream_type;
+ stream->ts_number_video_pids = 1;
+ }
+ else
+ {
+ // Defined audio stream types are 0x81 for AC-3/A52 audio and 0x03
+ // for mpeg audio. But content producers seem to use other
+ // values (0x04 and 0x06 have both been observed) so at this point
+ // we say everything that isn't a video pid is audio then at the end
+ // of hb_stream_title_scan we'll figure out which are really audio
+ // by looking at the PES headers.
+ i = stream->ts_number_audio_pids;
+ if (i < kMaxNumberAudioPIDS)
+ {
+ stream->ts_audio_pids[i] = elementary_PID;
+ stream->ts_stream_type[1 + i] = stream_type;
+ if (ES_info_length > 0)
+ {
+ decode_element_descriptors(stream, i, ES_info_buf,
+ ES_info_length);
+ }
+ ++stream->ts_number_audio_pids;
+ }
+ }
- if (cur_pos >= section_length - 4 /* stop before the CRC */)
- done_reading_stream_types = 1;
- }
+ cur_pos += 5 /* stream header */ + ES_info_length;
+
+ free(ES_info_buf);
+
+ if (cur_pos >= section_length - 4 /* stop before the CRC */)
+ done_reading_stream_types = 1;
+ }
free(descriptor_buf);
return 1;
}
-// ------------------------------------------------------------------------------------
-
-int build_program_map(unsigned char *buf, hb_stream_t *stream)
+static int build_program_map(const uint8_t *buf, hb_stream_t *stream)
{
// Get adaption header info
int adapt_len = 0;
return 0;
}
-int decode_PAT(unsigned char *buf, hb_stream_t *stream)
+static int decode_PAT(const uint8_t *buf, hb_stream_t *stream)
{
unsigned char tablebuf[1024];
unsigned int tablepos = 0;
static void hb_ts_stream_find_pids(hb_stream_t *stream)
{
- unsigned char buf[188];
-
// align to first packet
- align_to_next_packet(stream->file_handle);
+ align_to_next_packet(stream);
// Read the Transport Stream Packets (188 bytes each) looking at first for PID 0 (the PAT PID), then decode that
// to find the program map PID and then decode that to get the list of audio and video PIDs
- int bytesReadInPacket = 0;
for (;;)
{
- // Try to read packet..
- int bytesRead;
- if ((bytesRead = fread(buf+bytesReadInPacket, 1, 188-bytesReadInPacket, stream->file_handle)) != 188-bytesReadInPacket)
- {
- if (bytesRead < 0)
- bytesRead = 0;
- bytesReadInPacket += bytesRead;
-
+ const uint8_t *buf = next_packet( stream );
+ if ( buf == NULL )
+ {
hb_log("hb_ts_stream_find_pids - end of file");
break;
}
- else
- {
- bytesReadInPacket = 0;
- }
-
- // Check sync byte
- if ((buf[0] != 0x47) && (buf[0] != 0x72) && (buf[0] != 0x29))
- {
- off_t pos = ftello(stream->file_handle) - 188;
- off_t pos2 = align_to_next_packet(stream->file_handle);
- if ( pos2 == 0 )
- {
- hb_log( "hb_ts_stream_find_pids: eof while re-establishing sync @ %lld",
- pos );
- break;
- }
- hb_log("hb_ts_stream_decode: sync lost @%lld, regained after %lld bytes",
- pos, pos2 );
- continue;
- }
// Get pid
int pid = (((buf[1] & 0x1F) << 8) | buf[2]) & 0x1FFF;
hb_log("hb_ts_stream_find_pids - found the following PIDS");
hb_log(" Video PIDS : ");
- int i=0;
+ int i;
for (i=0; i < stream->ts_number_video_pids; i++)
{
- hb_log(" 0x%x (%d)", stream->ts_video_pids[i], stream->ts_video_pids[i]);
+ hb_log( " 0x%x type %s (0x%x)",
+ stream->ts_video_pids[i],
+ stream_type_name(stream->ts_stream_type[i]),
+ stream->ts_stream_type[i]);
}
hb_log(" Audio PIDS : ");
for (i = 0; i < stream->ts_number_audio_pids; i++)
{
- hb_log(" 0x%x (%d)", stream->ts_audio_pids[i], stream->ts_audio_pids[i]);
+ hb_log( " 0x%x type %s (0x%x)",
+ stream->ts_audio_pids[i],
+ stream_type_name(stream->ts_stream_type[i+1]),
+ stream->ts_stream_type[i+1] );
}
}
int len;
// we always ship a PACK header plus all the data in our demux buf.
- // AC3 audio also always needs it substream header.
+ // AC3 audio also always needs its substream header.
len = 14 + stream->ts_pos[curstream];
- if ( stream->ts_audio_stream_type[curstream] == 0x81)
+ if ( stream->ts_stream_type[curstream] == 0x81)
{
len += 4;
}
tdat[3] = stream->ts_streamid[curstream];
uint16_t plen = stream->ts_pos[curstream] - 6;
- if ( stream->ts_audio_stream_type[curstream] == 0x81)
+ if ( stream->ts_stream_type[curstream] == 0x81)
{
// We have to add an AC3 header in front of the data. Add its
// size to the PES packet length.
{
// data without a PES start header needs a simple 'continuation'
// PES header. AC3 audio also needs its substream header.
- if ( stream->ts_audio_stream_type[curstream] != 0x81)
+ if ( stream->ts_stream_type[curstream] != 0x81)
{
make_pes_header(stream, stream->ts_pos[curstream],
stream->ts_streamid[curstream]);
stream->ts_pos[curstream] = 0;
}
-static void ts_warn_helper( hb_stream_t *stream, char *log, va_list args )
+static int isIframe( hb_stream_t *stream, const uint8_t *buf, int adapt_len )
{
- // limit error printing to at most one per minute of video (at 30fps)
- ++stream->errors;
- if ( stream->frames - stream->last_error_frame >= 30*60 )
- {
- char msg[256];
+ // For mpeg2: look for a gop start or i-frame picture start
+ // for h.264: look for idr nal type or a slice header for an i-frame
+ // for vc1: ???
+ int i;
+ uint32_t strid = 0;
- vsnprintf( msg, sizeof(msg), log, args );
- if ( stream->errors - stream->last_error_count < 10 )
- {
- hb_log( "stream: error near frame %d: %s", stream->frames, msg );
- }
- else
+ if ( stream->ts_stream_type[0] <= 2 )
+ {
+ // This section of the code handles MPEG-1 and MPEG-2 video streams
+ for (i = 13 + adapt_len; i < 188; i++)
{
- int Edelta = stream->errors - stream->last_error_count;
- double Epcnt = (double)Edelta * 100. /
- (stream->frames - stream->last_error_frame);
- hb_log( "stream: %d new errors (%.0f%%) up to frame %d: %s",
- Edelta, Epcnt, stream->frames, msg );
+ strid = (strid << 8) | buf[i];
+ if ( ( strid >> 8 ) == 1 )
+ {
+ // we found a start code
+ uint8_t id = strid;
+ switch ( id )
+ {
+ case 0xB8: // group_start_code (GOP header)
+ case 0xB3: // sequence_header code
+ return 1;
+
+ case 0x00: // picture_start_code
+ // picture_header, let's see if it's an I-frame
+ if (i<185)
+ {
+ // check if picture_coding_type == 1
+ if ((buf[i+2] & (0x7 << 3)) == (1 << 3))
+ {
+ // found an I-frame picture
+ return 1;
+ }
+ }
+ break;
+ }
+ }
}
- stream->last_error_frame = stream->frames;
- stream->last_error_count = stream->errors;
+ // didn't find an I-frame
+ return 0;
}
-}
-
-static void ts_warn( hb_stream_t *stream, char *log, ... )
-{
- va_list args;
- va_start( args, log );
- ts_warn_helper( stream, log, args );
- va_end( args );
-}
-
-static void ts_err( hb_stream_t *stream, int curstream, char *log, ... )
-{
- va_list args;
- va_start( args, log );
- ts_warn_helper( stream, log, args );
- va_end( args );
-
- stream->ts_skipbad[curstream] = 1;
- stream->ts_pos[curstream] = 0;
- stream->ts_streamcont[curstream] = -1;
-}
-
-static int isIframe( const uint8_t *buf, int adapt_len )
-{
- // Look for the Group of Pictures packet
- int i;
- uint32_t strid = 0;
-
- for (i = 4 + adapt_len; i < 188; i++)
+ if ( stream->ts_stream_type[0] == 0x1b )
{
- strid = (strid << 8) | buf[i];
- switch ( strid )
+ // we have an h.264 stream
+ for (i = 13 + adapt_len; i < 188; i++)
{
- case 0x000001B8: // group_start_code (GOP header)
- case 0x000001B3: // sequence_header code
- return 1;
+ strid = (strid << 8) | buf[i];
+ if ( ( strid >> 8 ) == 1 )
+ {
+ // we found a start code - remove the ref_idc from the nal type
+ uint8_t nal_type = strid & 0x1f;
+ if ( nal_type == 0x05 )
+ // h.264 IDR picture start
+ return 1;
- case 0x00000100: // picture_start_code
- // picture_header, let's see if it's an I-frame
- if (i<185)
+ if ( nal_type == 0x01 )
{
- // check if picture_coding_type == 1
- if ((buf[i+2] & (0x7 << 3)) == (1 << 3))
+ // h.264 slice: has to be start MB 0 & type I (2, 4, 7 or 9)
+ uint8_t id = buf[i+1];
+ if ( ( id >> 4 ) == 0x0b || ( id >> 2 ) == 0x25 ||
+ id == 0x88 || id == 0x8a )
{
- // found an I-frame picture
return 1;
}
}
- break;
+ }
}
+ // didn't find an I-frame
+ return 0;
}
- // didn't find an I frame
- return 0;
+
+ // we don't understand the stream type so just say "yes" otherwise
+ // we'll discard all the video.
+ return 1;
}
/***********************************************************************
**********************************************************************/
static int hb_ts_stream_decode( hb_stream_t *stream, uint8_t *obuf )
{
- int64_t pcr = stream->ts_lastpcr;
- int curstream;
- uint8_t buf[188];
-
/*
* stash the output buffer pointer in our stream so we don't have to
* pass it & its original value to everything we call.
// spin until we get a packet of data from some stream or hit eof
while ( 1 )
{
- if ((fread(buf, 188, 1, stream->file_handle)) != 1)
- {
+ int64_t pcr = stream->ts_lastpcr;
+ int curstream;
+
+ const uint8_t *buf = next_packet(stream);
+ if ( buf == NULL )
+ {
// end of file - we didn't finish filling our ps write buffer
// so just discard the remainder (the partial buffer is useless)
hb_log("hb_ts_stream_decode - eof");
/* This next section validates the packet */
- // Check sync byte
- if ((buf[0] != 0x47) && (buf[0] != 0x72) && (buf[0] != 0x29))
- {
- // lost sync - back up to where we started then try to
- // re-establish sync.
- off_t pos = ftello(stream->file_handle) - 188;
- off_t pos2 = align_to_next_packet(stream->file_handle);
- if ( pos2 == 0 )
- {
- hb_log( "hb_ts_stream_decode: eof while re-establishing sync @ %lld",
- pos );
- return 0;
- }
- ts_warn( stream, "hb_ts_stream_decode: sync lost @%lld, "
- "regained after %lld bytes", pos, pos2 );
- continue;
- }
-
// Get pid and use it to find stream state.
int pid = ((buf[1] & 0x1F) << 8) | buf[2];
if ( ( curstream = index_of_pid( pid, stream ) ) < 0 )
stream->ts_lastpcr = pcr;
}
- if ( pcr == -1 )
- {
- // don't accumulate data until we get a pcr
- continue;
- }
+ // If we don't have a pcr yet, the right thing to do here would
+ // be a 'continue' so we don't process anything until we have a
+ // clock reference. Unfortunately the HD Home Run appears to null
+ // out the pcr field of some streams so we keep going & substitute
+ // the video stream dts for the pcr when there's no pcr.
// Get continuity
// Continuity only increments for adaption values of 0x3 or 0x01
continue;
}
if ( !start && (stream->ts_streamcont[curstream] != -1) &&
+ stream->ts_foundfirst[curstream] &&
(continuity != ( (stream->ts_streamcont[curstream] + 1) & 0xf ) ) )
{
ts_err( stream, curstream, "continuity error: got %d expected %d",
{
// video skips to an iframe after a bad packet to minimize
// screen corruption
- if ( curstream == 0 && !isIframe( buf, adapt_len ) )
+ if ( curstream == 0 && !isIframe( stream, buf, adapt_len ) )
{
continue;
}
{
if ( !stream->ts_foundfirst[0] )
{
- if ( !isIframe( buf, adapt_len ) )
+ if ( !isIframe( stream, buf, adapt_len ) )
{
// didn't find an I frame
continue;
stream->ts_foundfirst[0] = 1;
}
++stream->frames;
+
+ // if we don't have a pcr yet use the dts from this frame
+ if ( pcr == -1 )
+ {
+ // PES must begin with an mpeg start code & contain
+ // a DTS or PTS.
+ const uint8_t *pes = buf + adapt_len + 4;
+ if ( pes[0] != 0x00 || pes[1] != 0x00 || pes[2] != 0x01 ||
+ ( pes[7] >> 6 ) == 0 )
+ {
+ continue;
+ }
+ // if we have a dts use it otherwise use the pts
+ pes += (pes[7] & 0x40)? 14 : 9;
+
+ pcr = ( (uint64_t)(pes[0] & 0xe ) << 29 );
+ pcr |= ( pes[1] << 22 ) |
+ ( ( pes[2] >> 1 ) << 15 ) |
+ ( pes[3] << 7 ) |
+ ( pes[4] >> 1 );
+ stream->ts_nextpcr = pcr;
+ }
}
- else if ( ! stream->ts_foundfirst[curstream] )
+ else if ( ! stream->ts_foundfirst[curstream] )
{
// start other streams only after first video frame found.
if ( ! stream->ts_foundfirst[0] )
}
}
-/***********************************************************************
- * hb_ts_stream_reset
- ***********************************************************************
- *
- **********************************************************************/
static void hb_ts_stream_reset(hb_stream_t *stream)
{
int i;
stream->last_error_frame = -10000;
stream->last_error_count = 0;
- align_to_next_packet(stream->file_handle);
+ align_to_next_packet(stream);
+}
+
+// ------------------------------------------------------------------
+// Support for reading media files via the ffmpeg libraries.
+
+static void ffmpeg_add_codec( hb_stream_t *stream, int stream_index )
+{
+ // add a codec to the context here so it will be there when we
+ // read the first packet.
+ AVCodecContext *context = stream->ffmpeg_ic->streams[stream_index]->codec;
+ context->workaround_bugs = FF_BUG_AUTODETECT;
+ context->error_recognition = 1;
+ context->error_concealment = FF_EC_GUESS_MVS|FF_EC_DEBLOCK;
+ AVCodec *codec = avcodec_find_decoder( context->codec_id );
+ avcodec_open( context, codec );
+}
+
+// The ffmpeg stream reader / parser shares a lot of state with the
+// decoder via a codec context kept in the AVStream of the reader's
+// AVFormatContext. Since decoding is done in a different thread we
+// have to somehow pass this codec context to the decoder and we have
+// to do it before the first packet is read (so we can't put the info
+// in the buf we'll send downstream). Decoders don't have any way to
+// get to the stream directly (they're not passed the title or job
+// pointers during a scan) so this is a back door for the decoder to
+// get the codec context. We just stick the stream pointer in the next
+// slot an array of pointers maintained as a circular list then return
+// the index into the list combined with the ffmpeg stream index as the
+// codec_param that will be passed to the decoder init routine. We make
+// the list 'big' (enough for 1024 simultaneously open ffmpeg streams)
+// so that we don't have to do a complicated allocator or worry about
+// deleting entries on close.
+//
+// Entries can only be added to this list during a scan and are never
+// deleted so the list access doesn't require locking.
+static hb_stream_t **ffmpeg_streams; // circular list of stream pointers
+static int ffmpeg_stream_cur; // where we put the last stream pointer
+#define ffmpeg_sl_bits (10) // log2 stream list size (in entries)
+#define ffmpeg_sl_size (1 << ffmpeg_sl_bits)
+
+// add a stream to the list & return the appropriate codec_param to access it
+static int ffmpeg_codec_param( hb_stream_t *stream, int stream_index )
+{
+ if ( !ffmpeg_streams )
+ {
+ ffmpeg_streams = calloc( ffmpeg_sl_size, sizeof(stream) );
+ }
+
+ // the title scan adds all the ffmpeg media streams at once so we
+ // only add a new entry to our stream list if the stream is different
+ // than last time.
+ int slot = ffmpeg_stream_cur;
+ if ( ffmpeg_streams[slot] != stream )
+ {
+ // new stream - put it in the next slot of the stream list
+ slot = ++ffmpeg_stream_cur & (ffmpeg_sl_size - 1);
+ ffmpeg_streams[slot] = stream;
+ }
+
+ ffmpeg_add_codec( stream, stream_index );
+
+ return ( stream_index << ffmpeg_sl_bits ) | slot;
+}
+
+// we're about to open 'title' to convert it - remap the stream associated
+// with the video & audio codec params of the title to refer to 'stream'
+// (the original scan stream was closed and no longer exists).
+static void ffmpeg_remap_stream( hb_stream_t *stream, hb_title_t *title )
+{
+ // tell ffmpeg we want a pts on every frame it returns
+ stream->ffmpeg_ic->flags |= AVFMT_FLAG_GENPTS;
+
+ // all the video & audio came from the same stream so remapping
+ // the video's stream slot takes care of everything.
+ int slot = title->video_codec_param & (ffmpeg_sl_size - 1);
+ ffmpeg_streams[slot] = stream;
+
+ // add codecs for all the streams used by the title
+ ffmpeg_add_codec( stream, title->video_codec_param >> ffmpeg_sl_bits );
+
+ int i;
+ hb_audio_t *audio;
+ for ( i = 0; ( audio = hb_list_item( title->list_audio, i ) ); ++i )
+ {
+ if ( audio->config.in.codec == HB_ACODEC_FFMPEG )
+ {
+ ffmpeg_add_codec( stream,
+ audio->config.in.codec_param >> ffmpeg_sl_bits );
+ }
+ }
+}
+
+void *hb_ffmpeg_context( int codec_param )
+{
+ int slot = codec_param & (ffmpeg_sl_size - 1);
+ int stream_index = codec_param >> ffmpeg_sl_bits;
+ return ffmpeg_streams[slot]->ffmpeg_ic->streams[stream_index]->codec;
}
+void *hb_ffmpeg_avstream( int codec_param )
+{
+ int slot = codec_param & (ffmpeg_sl_size - 1);
+ int stream_index = codec_param >> ffmpeg_sl_bits;
+ return ffmpeg_streams[slot]->ffmpeg_ic->streams[stream_index];
+}
+
+static AVFormatContext *ffmpeg_deferred_close;
+
+static int ffmpeg_open( hb_stream_t *stream, hb_title_t *title )
+{
+ if ( ffmpeg_deferred_close )
+ {
+ av_close_input_file( ffmpeg_deferred_close );
+ ffmpeg_deferred_close = NULL;
+ }
+ AVFormatContext *ic;
+
+ av_log_set_level( AV_LOG_ERROR );
+ if ( av_open_input_file( &ic, stream->path, NULL, 0, NULL ) < 0 )
+ {
+ return 0;
+ }
+ if ( av_find_stream_info( ic ) < 0 )
+ goto fail;
+
+ stream->ffmpeg_ic = ic;
+ stream->hb_stream_type = ffmpeg;
+ stream->ffmpeg_pkt = malloc(sizeof(*stream->ffmpeg_pkt));
+ av_init_packet( stream->ffmpeg_pkt );
+
+ if ( title )
+ {
+ // we're opening for read. scan passed out codec params that
+ // indexed its stream so we need to remap them so they point
+ // to this stream.
+ ffmpeg_remap_stream( stream, title );
+ ffmpeg_seek( stream, 0. );
+ av_log_set_level( AV_LOG_ERROR );
+ }
+ else
+ {
+ // we're opening for scan. let ffmpeg put some info into the
+ // log about what we've got.
+ av_log_set_level( AV_LOG_INFO );
+ dump_format( ic, 0, stream->path, 0 );
+ av_log_set_level( AV_LOG_ERROR );
+
+ // accept this file if it has at least one video stream we can decode
+ int i;
+ for (i = 0; i < ic->nb_streams; ++i )
+ {
+ if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO )
+ {
+ break;
+ }
+ }
+ if ( i >= ic->nb_streams )
+ goto fail;
+ }
+ return 1;
+
+ fail:
+ av_close_input_file( ic );
+ return 0;
+}
+
+static void ffmpeg_close( hb_stream_t *d )
+{
+ // XXX since we're sharing the CodecContext with the downstream
+ // decoder proc we can't close the stream. We need to reference count
+ // this so we can close it when both are done with their instance but
+ // for now just defer the close until the next stream open or close.
+ if ( ffmpeg_deferred_close )
+ {
+ av_close_input_file( ffmpeg_deferred_close );
+ }
+ ffmpeg_deferred_close = d->ffmpeg_ic;
+ if ( d->ffmpeg_pkt != NULL )
+ {
+ free( d->ffmpeg_pkt );
+ d->ffmpeg_pkt = NULL;
+ }
+}
+
+static void add_ffmpeg_audio( hb_title_t *title, hb_stream_t *stream, int id )
+{
+ AVStream *st = stream->ffmpeg_ic->streams[id];
+ AVCodecContext *codec = st->codec;
+
+ // scan will ignore any audio without a bitrate. Since we've already
+ // typed the audio in order to determine its codec we set up the audio
+ // paramters here.
+ if ( codec->bit_rate || codec->sample_rate )
+ {
+ static const int chan2layout[] = {
+ HB_INPUT_CH_LAYOUT_MONO, // We should allow no audio really.
+ HB_INPUT_CH_LAYOUT_MONO,
+ HB_INPUT_CH_LAYOUT_STEREO,
+ HB_INPUT_CH_LAYOUT_2F1R,
+ HB_INPUT_CH_LAYOUT_2F2R,
+ HB_INPUT_CH_LAYOUT_3F2R,
+ HB_INPUT_CH_LAYOUT_4F2R,
+ HB_INPUT_CH_LAYOUT_STEREO,
+ HB_INPUT_CH_LAYOUT_STEREO,
+ };
+
+ hb_audio_t *audio = calloc( 1, sizeof(*audio) );;
+
+ audio->id = id;
+ if ( codec->codec_id == CODEC_ID_AC3 )
+ {
+ audio->config.in.codec = HB_ACODEC_AC3;
+ }
+ else
+ {
+ audio->config.in.codec = HB_ACODEC_FFMPEG;
+ audio->config.in.codec_param = ffmpeg_codec_param( stream, id );
+
+ audio->config.in.bitrate = codec->bit_rate? codec->bit_rate : 1;
+ audio->config.in.samplerate = codec->sample_rate;
+ audio->config.in.channel_layout = chan2layout[codec->channels & 7];
+ }
+
+ set_audio_description( audio, lang_for_code2( st->language ) );
+
+ hb_list_add( title->list_audio, audio );
+ }
+}
+
+static hb_title_t *ffmpeg_title_scan( hb_stream_t *stream )
+{
+ AVFormatContext *ic = stream->ffmpeg_ic;
+
+ // 'Barebones Title'
+ hb_title_t *title = hb_title_init( stream->path, 0 );
+ title->index = 1;
+
+ // Copy part of the stream path to the title name
+ char *sep = strrchr(stream->path, '/');
+ if (sep)
+ strcpy(title->name, sep+1);
+ char *dot_term = strrchr(title->name, '.');
+ if (dot_term)
+ *dot_term = '\0';
+
+ uint64_t dur = ic->duration * 90000 / AV_TIME_BASE;
+ title->duration = dur;
+ dur /= 90000;
+ title->hours = dur / 3600;
+ title->minutes = ( dur % 3600 ) / 60;
+ title->seconds = dur % 60;
+
+ // One Chapter
+ hb_chapter_t * chapter;
+ chapter = calloc( sizeof( hb_chapter_t ), 1 );
+ chapter->index = 1;
+ chapter->duration = title->duration;
+ chapter->hours = title->hours;
+ chapter->minutes = title->minutes;
+ chapter->seconds = title->seconds;
+ hb_list_add( title->list_chapter, chapter );
+
+ // set the title to decode the first video stream in the file
+ title->demuxer = HB_NULL_DEMUXER;
+ title->video_codec = 0;
+ int i;
+ for (i = 0; i < ic->nb_streams; ++i )
+ {
+ if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO &&
+ avcodec_find_decoder( ic->streams[i]->codec->codec_id ) &&
+ title->video_codec == 0 )
+ {
+ title->video_id = i;
+
+ // We have to use the 'internal' avcodec decoder because
+ // it needs to share the codec context from this video
+ // stream. The parser internal to av_read_frame
+ // passes a bunch of state info to the decoder via the context.
+ title->video_codec = WORK_DECAVCODECVI;
+ title->video_codec_param = ffmpeg_codec_param( stream, i );
+ }
+ else if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO &&
+ avcodec_find_decoder( ic->streams[i]->codec->codec_id ) )
+ {
+ add_ffmpeg_audio( title, stream, i );
+ }
+ }
+
+ title->container_name = strdup( ic->iformat->name );
+ title->data_rate = ic->bit_rate;
+
+ return title;
+}
+
+static int64_t av_to_hb_pts( int64_t pts, double conv_factor )
+{
+ if ( pts == AV_NOPTS_VALUE )
+ return -1;
+ return (int64_t)( (double)pts * conv_factor );
+}
+
+static int ffmpeg_read( hb_stream_t *stream, hb_buffer_t *buf )
+{
+ int err;
+ if ( ( err = av_read_frame( stream->ffmpeg_ic, stream->ffmpeg_pkt )) < 0 )
+ {
+ // XXX the following conditional is to handle avi files that
+ // use M$ 'packed b-frames' and occasionally have negative
+ // sizes for the null frames these require.
+ if ( err != AVERROR_NOMEM || stream->ffmpeg_pkt->size >= 0 )
+ // eof
+ return 0;
+ }
+ if ( stream->ffmpeg_pkt->size <= 0 )
+ {
+ // M$ "invalid and inefficient" packed b-frames require 'null frames'
+ // following them to preserve the timing (since the packing puts two
+ // or more frames in what looks like one avi frame). The contents and
+ // size of these null frames are ignored by the ff_h263_decode_frame
+ // as long as they're < 20 bytes. We need a positive size so we use
+ // one byte if we're given a zero or negative size. We don't know
+ // if the pkt data points anywhere reasonable so we just stick a
+ // byte of zero in our outbound buf.
+ buf->size = 1;
+ *buf->data = 0;
+ }
+ else
+ {
+ if ( stream->ffmpeg_pkt->size > buf->alloc )
+ {
+ // need to expand buffer
+ hb_buffer_realloc( buf, stream->ffmpeg_pkt->size );
+ }
+ memcpy( buf->data, stream->ffmpeg_pkt->data, stream->ffmpeg_pkt->size );
+ buf->size = stream->ffmpeg_pkt->size;
+ }
+ buf->id = stream->ffmpeg_pkt->stream_index;
+
+ // if we haven't done it already, compute a conversion factor to go
+ // from the ffmpeg timebase for the stream to HB's 90KHz timebase.
+ double tsconv = stream->ffmpeg_tsconv[stream->ffmpeg_pkt->stream_index];
+ if ( ! tsconv )
+ {
+ AVStream *s = stream->ffmpeg_ic->streams[stream->ffmpeg_pkt->stream_index];
+ tsconv = 90000. * (double)s->time_base.num / (double)s->time_base.den;
+ stream->ffmpeg_tsconv[stream->ffmpeg_pkt->stream_index] = tsconv;
+ }
+
+ buf->start = av_to_hb_pts( stream->ffmpeg_pkt->pts, tsconv );
+ buf->renderOffset = av_to_hb_pts( stream->ffmpeg_pkt->dts, tsconv );
+ if ( buf->renderOffset >= 0 && buf->start == -1 )
+ {
+ buf->start = buf->renderOffset;
+ }
+ av_free_packet( stream->ffmpeg_pkt );
+ return 1;
+}
+
+static int ffmpeg_seek( hb_stream_t *stream, float frac )
+{
+ AVFormatContext *ic = stream->ffmpeg_ic;
+ int64_t pos = (double)ic->duration * (double)frac;
+ av_seek_frame( ic, -1, pos, pos? 0 : AVSEEK_FLAG_BACKWARD );
+ return 1;
+}
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